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Insurance Matters (Details) (February 2011 West Storage Incident [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
February 2011 West Storage Incident [Member] |  |
Loss Contingencies [Line Items] |  |
Proceeds from property damage insurance recoveries | $ 95.0 | $ 8.8
Gains related to property damage proceeds | $ 95.0 | $ 8.8

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- Definition Represents gains related to property damage insurance proceeds received during the period disclosed. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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Period Type: | duration